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Three girls at the EYH camp with their spinning electric motor.

Growing Cracks in Nanomaterials Christopher L. Muhlstein, Pennsylvania State Univ University Park, DMR 0449684.

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Three girls at the EYH camp with their spinning electric motor.

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  1. Growing Cracks in NanomaterialsChristopher L. Muhlstein, Pennsylvania State Univ University Park, DMR 0449684 • Our research explores how nanomaterials bend, twist and break. Recently we have studied how cracks grow when loads are applied cyclically. This “fatigue” is one of the most important failure modes, and is a critical parameter for future component design. • The critical conclusions for nanograined Pt films are: • They are more stable during mechanical loading than other pure metal systems. • Slow growing fatigue cracks cause the grains to coarsen. • Faster fatigue cracks do not cause grain coarsening. Fatigue cracks in Pt films travel between the nanoscale grains when growing slowly, but transition to a transgranular path as they speed up.

  2. Education and OutreachChristopher L. Muhlstein, Pennsylvania State Univ University Park, DMR 0449684 This year we adapted our previously developed classroom materials for use in “camp” activities that focus on girls (6-8th grades) from all over Pennsylvania who are interested in science. Two of our female graduate students (M. Steighner and A. Romasco who is funded by CCMI-0800619 and co-advised by S. Mohney) participated in the Pennsylvania State University’s annual Expanding Your Horizons (EYH) camp which was hosted by the local Women in Engineering and Science organization (WISE). Three girls at the EYH camp with their spinning electric motor.

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